Is it that AMD have too many quads on their hands or something? Because I'd have thought that unless you were fairly lucky, getting one of these chips and unlocking the extra cores would stand a good chance of presenting a core either broken in style or not capable of running at the speeds given.

But then, AMD aren't saying 'buy our dual cores and get a free upgrade to quad core with xyz motherboard' so if a chip doesn't work, no one can go crying...